John balz



(No Model.)

J. BALZ.

TOOL HANDLE.

ATTORNEY,

NITE STATES PATENT FFICE.

JOHN BALZ, or SYRACUSE, NEW YORK, ASSIGNOR TO THOMAS HOOKER,- OF SAMEPLACE.

TOOL-HANDLE.

SPECIFICATION forming part of Letters Patent No. 333,192, dated December29, 1885. A

Application filed September 12, 1885. Serial No. 176,897. (No model.)

To all whom it may concern:

Be it known that I, JOHN BALZ, a citizen of the United States, residingat Syracuse, in the county of Onondaga and State of New York,

have invented certain new and useful Improvements in Tool-Holders, ofwhich the following is a specification, reference being had to theaccompanying drawings.

This invention relates to tool-holders, and

.10 has reference to a clamping device secured to a handle and adaptedto be used in connection with tools of various kinds and sizes whichhave at their ends a tapered enlargement or head.

The tool-holder is illustrated in the present instance as applied to abit-stock, the tapered enlargement or head required in the tool beingsuch as is common in bits.

The invention consists in certain features of construction hereinafterdescribed, and particularly pointed out in the claims.

Referring to the drawings, Figure 1 represents in side elevation, partlyin section, a bit-stock provided with a tool-holder con- 2 5 structed inaccordance with my invention. Fig. 2 is a central vertical section ofthe toolholder portion. Fig. 3 is an end elevation of the tool-holder.Fig. 4 is a section on the line a: :r of Fig. 1, looking in thedirection of the 0 arrows; and Fig. 5 is an enlarged end elevation, withthe tool in section on the line y y,

looking in the direction of the arrow.

Like letters indicate like parts in all the figures.

The body portion A of the tool-holder is provided with a pyramidalcavity, A, axially disposed in the body, and having its largest diameterat the end thereof. The outline of this cavity A in cross-section may besquare 0 or polygonal to agree with the various shaped heads formed ontool-shanks. In this instance it is shown as being square incross-section at all points. The body portion is eXteriorlyscrew-threaded, as at A. The cap B is inte- 5 riorly screw-threaded tofit the body A, and is provided at its end with a square aperture, 13,the dimensions of which from either side to the other is greater thansimilar dimensions of any tool-head intended to be clamped by the cap,and slightly greater than the dimensions of the cavity Aat its outerend, as here inafter described.

The relative dimensions of the tool-head and aperture B will be clearlyunderstood by reference to Fig. 2, where the tool-head O is of suchdimensions on each of its four faces as will freely pass through theaperture B of the cap B when the sides of the head 0 are parallel withthe sides of the opening B. Therefore, when the sides of the aperture Aand those of the tool-head O and of the opening B, are all parallel witheach other, the head 0 may be readily introduced through the cap intothe cavity A, so that the shoulder G, in tervening between the shank Oand the head 0 of the tool, will be between the end of theloody A andthe inner surface of the end of the cap B, so that somewhere during thetravel of the nut B on the threads A the sides of the opening B of thecap will come in contact with and be disposed across the shoulders G ofthe tool, while the sides of the head 0 of said tool will bear againstthe inclined walls of the cavity A of the head, so as to center the toolin the holder and to resist the draft of the cap 7 on the shoulders, andthus centrally and firmly bind the tool to the handle.

It will be noticed that it requires an eighth of a turn of the'cap B tothrow the sides of its aperture across the shoulders of the tool. Now,if the threads on the body he sixteen (16) to the inch, an eighth of aturn would carry the cap longitudinally on the body one one hundred andtwenty eighth of an inch, so that a pressure of a tool-head into acavity A sufficient to cause the shoulder to move about oneone-hundredth of an inch will permit of an eighth of a revolution of thecap, to bring the sides of its perforation across the shoulders, whenwithout said pressure the de- 0 sired relative position of the partsmight not be secured; but, as such shoulders are usually tapering, thecap will surely engage therewith.

I am well aware that heretofore caps with 5 angular openings in theirends have been mounted upon screw-threaded bodies, so as to bring thesides of their openings across the shoulders of bits and other tools;but,so far as I am aware, such caps have been slotted at at 10c sidethereof, the slot communicating with the opening in the end of the cap,in order that the head of the tool might be introduced laterally intothe cavity of the head and so as to bring its shoulders inside of thecap, when a partial turn or turns thereof would cause it to bind on thewalls.

In addition to the above construction,other devices-as a slidingplate-have also been employed; but I am not aware of any toolholderwherein the cavity in the body portion and the opening in thecompletely-cylindrical head have been proportioned to each other ashereinbefore described and capable of the operation mentioned.

By retaining the completelycylindrical form in the cap it is clear thatgreater strength is secured, less expense in the manufacture isnecessary, and a firmer, truer, more central attachment of a tool to ahandle results.

If desired, the body portion may be formed as a ferrule or tip, intowhich any desired form of handle may be inserted, or as a round shankforming a drill-chuck, and I therefore do not wish to limit my inventionto any exact means of connecting the body portion A to any desired tool.

It is not absolutely essential that the tool head should bear completelyalong the walls of the cavity A, as, if it bears at the month only ofsaid cavity, it will be firmly bound by the cap; hence tool-heads ofvaried or various tapers may be clamped.

Having described my invention, what I claim is- 1. The combination, withthe exteriorlyscrew-threaded body having the central cavity of thecharacter described, of a completelycylindrical cap, B,having apolygonal opening, B, in its end, and interiorly screw-threaded to fitthe body A, substantially as specified.

2. The combination of the exteriorly-screwthreaded body A, having thepolygonal central cavity, A, of the completely-cylindrical.

cap B, mounted directly upon the body A,and having the central polygonalopening, B, at least equal in dimension to that of the cavity at the endof the body, substantially as specified.

In testimony whereof I affix my signature in presence of two witnesses.

JOHN BALZ.

Witnesses:

THOMAS HOOKER, E. O. WRIGHT.

